CASQA LIDI BIORETENTION DETAILS · design notes 1.bioretention facility design should optimize the flat bottom dimensions (i.e., width, length) to maximize the functional area of

CASQA‐LIDI BIORETENTION DETAILSTABLE OF CONTENTS

NAME NO.

STREET SIDE BIORETENTION (WITH PARKING)

STREET SLOPE‐SIDED BIORETENTION, WITH PARKING, WITH UNDERDRAIN SW‐1

STREET SLOPE‐SIDED BIORETENTION, WITH PARKING, NO UNDERDRAIN SW‐1A

STREET BIORETENTION PLANTER BOX, WITH PARKING, WITH UNDERDRAIN SW‐2

STREET BIORETENTION PLANTER BOX, WITH PARKING, NO UNDERDRAIN SW‐2A

STREET SIDE BIORETENTION (NO PARKING)

STREET SLOPE‐SIDED BIORETENTION, NO PARKING, WITH UNDERDRAIN SW‐3

STREET SLOPE‐SIDED BIORETENTION, NO PARKING, NO UNDERDRAIN SW‐3A

STREET BIORETENTION PLANTER BOX, NO PARKING, WITH UNDERDRAIN SW‐4

STREET BIORETENTION PLANTER BOX, NO PARKING, NO UNDERDRAIN SW‐4A

STREET BIORETENTION BULB OUT, NO PARKING, NO UNDERDRAIN SW‐5

STREET BIORETENTION BULB OUT, MID BLOCK CROSSING PLAN VIEW SW‐5.1

PARKING LOT BIORETENTION

PARKING LOT SLOPE‐SIDED BIORETENTION, WITH UNDERDRAIN SW‐6

PARKING LOT SLOPE‐SIDED BIORETENTION, NO UNDERDRAIN SW‐6A

PARKING LOT BIORETENTION PLANTER BOX, WITH UNDERDRAIN SW‐7

PARKING LOT BIORETENTION PLANTER BOX, NO UNDERDRAIN SW‐7A

BIOFILTRATION PLANTER BOX (NO PARKING)

PLANTER BOX, NO PARKING SW‐9

APPURTENANT STRUCTURESCURB AND GUTTER SW‐12

CURB AND GUTTER SW‐12A

DEEP CURB SW‐13

THICKENED EDGE SIDEWALK SW‐14

FLUSH CURB AT SIDEWALK SW‐15

PARKING LOT EDGE OPTIONS SW‐16

CURB CUT INLET FOR PLANTERS SW‐17

CURB CUT INLET FOR SLOPE SIDED

BIORETENTION FACILITY

SW‐18

INLET WITH GRATE SW‐19

GRAVEL CHECK DAM SW‐20

CONCRETE CHECK DAM SW‐21

OVERFLOW STRUCTURE WITH BEEHIVE GRATE SW‐22

OVERFLOW STRUCTURE COLLAR SW‐22A

CASQA‐LIDI BIORETENTION DETAILSTABLE OF CONTENTS

NAME NO.

OVERFLOW STRUCTURE WITH SQUARE GRATE SW‐23

IMPERMEABLE LINER CONNECTION SW‐24

OTHERPERVIOUS PAVEMENT SW‐25

PLANTING INUNDATION ZONES & BIORETENTION PLANT LIST SW‐26

DRYWELL STORMWATER BMP SW‐27

SPECIFICATIONS

LOW IMPACT DEVELOPMENT STORMWATER MANAGEMENT STANDARD DETAILS

USE WITH STANDARD SPECIFICATIONS FOR PUBLIC WORK CONSTRUCTION

VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:

DEVELOPED UNDER PROP. 84 GRANT

CONSTRUCTION NOTES

1. MAINTAIN UNDISTURBED NATIVE SOIL BENCH TO SUPPORT ADJACENT SIDEWALK/ROAD. SEQUENCE WORK TO CONSTRUCT CURBSBEFORE EXCAVATING BIORETENTION AREA FOR AGGREGATE AND BSM.

2. SCARIFY SUBGRADE BEFORE INSTALLING BIORETENTION AREA AGGREGATE AND BSM.

3. FACILITY EXCAVATION TO ALLOW FOR SPECIFIED AGGREGATE, BSM, AND MULCH DEPTHS TO ACHIEVE FINISHED ELEVATIONS ONCIVIL PLANS.

4. INSTALL UNDERDRAIN WITH HOLES FACING DOWN. TOP OF UNDERDRAIN 6" BELOW TOP OF AGGREGATE LAYER. UNDERDRAINSLOPE MAY BE FLAT.

5. PLACE BSM IN 6" LIFTS. COMPACT EACH 6" LIFT OF BSM WITH LANDSCAPE ROLLER OR BY LIGHTLY WETTING. IF WETTING, LET DRYOVERNIGHT BEFORE PLANTING.

6. DO NOT WORK WITHIN BIORETENTION AREA DURING RAIN OR UNDER WET CONDITIONS.

7. KEEP HEAVY MACHINERY OUTSIDE BIORETENTION AREA LIMITS.

8. STORMWATER SHOULD BE DIRECTED AWAY FROM BIORETENTION UNTIL CONSTRUCTION IS COMPLETE AND DRAINAGE AREAVEGETATION IS STABILIZED.

SIDEWALK

MIN 24"BOTTOM WIDTH

DO NOT USE FILTER FABRICBETWEEN BSM AND AGGREGATE

CALTRANS CLASS 2 PERMEABLEMATERIAL (AGGREGATE). DEPTH PERPROJECT REQUIREMENTS ORMINIMUM 12", SEE DESIGN NOTE 10

OVERFLOW STRUCTUREELEV. (OE)

FINISHEDELEVATION(FE)

6" MIN NATIVE SOIL BENCH,12" PREFERRED OR ASDIRECTED BY CIVIL ORGEOTECHNICAL ENGINEER

STREET

SIDEWALKELEVATION (SE)

AGGREGATEBOTTOM WIDTH TO

MATCH BSM BOTTOMWIDTH

OVERFLOW OUTLET-CONNECT TO STORM DRAIN ORAPPROVED DISCHARGE LOCATIONNATIVE SIDE SLOPE

TO BE DETERMINEDBY GEOTECHNICALCONDITIONS.

MIN 1" DROPSEE DESIGN NOTE 16

3:1 MAX. WITHSHELF, SEENOTE 15

3" MULCHLAYER

6" MIN

6" MIN/12" MAX PONDING

2% SHELF,SEE NOTE 15

18" MINOR 24" IF

REQUIRED

2" MIN

6" MIN

UNDERDRAIN, MIN. 4" DIA. PVCSDR 35 PERFORATED PIPE, SEECONSTRUCTION NOTE 4

STREET

LEGENDMULCH/COMPOST LAYER(SEE DESIGN NOTE 12)

BIORETENTION SOIL MEDIA (BSM)

AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE

CURB INLETDETAILSW-18, GUTTERINLET ELEV.(GIE)

CURB ANDGUTTER DETAILSW-12A

STREET SLOPE-SIDED BIORETENTION WITHPARKING, WITH UNDERDRAIN SW-1

SHEET 1 OF 2



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


DESIGN NOTES

1. BIORETENTION FACILITY DESIGN SHOULD OPTIMIZE THE FLAT BOTTOM DIMENSIONS (I.E., WIDTH, LENGTH) TO MAXIMIZETHE FUNCTIONAL AREA OF THE FACILITY.

2. CAPTURE AND CONVEY OVERFLOW TO STORM DRAIN SYSTEM (DETAIL SW-22, SW-23). ALTERNATIVELY, CONVEYOVERFLOW TO APPROVED DISCHARGE LOCATION THROUGH OTHER OVERLAND METHODS (IE. CURB CUTS, SIDEWALKUNDERDRAIN, WEIR, ETC.).

3. PROVIDE SPOT ELEVATIONS AT INLETS AND OVERFLOW STRUCTURES ON CIVIL PLANS (FE, OE, GIE, SIE), PER DETAILSW-18.

4. DUE TO SITE VARIABILITY, TO ENSURE THE LONG-TERM STRUCTURAL STABILITY OF THE BIORETENTION FACILITY AND ANYADJACENT INFRASTRUCTURE CONSULT WITH A GEOTECHNICAL ENGINEER.

5. A VERTICAL LINER MAY BE USED FOR BIORETENTION FACILITIES TO PREVENT LATERAL FLOW AND TO SEPARATE THENATIVE SOIL FROM THE BSM AND THE AGGREGATE, HOWEVER A HORIZONTAL LINER SHALL NOT BE USED.

6. DO NOT USE FILTER FABRIC BETWEEN BSM AND AGGREGATE.

7. PROVIDE CAPPED, THREADED PVC CLEANOUT FOR UNDERDRAIN, 4" MIN. DIA. WITH SWEEP BEND.

8. PROVIDE A CLEAN-OUT/OBSERVATION PORT IN EACH FACILITY, PER BIORETENTION TECHNICAL SPECIFICATIONS.

9. ON LONGITUDINAL SLOPE, USE CHECK DAMS (DETAILS SW-20, SW-21)

10. DEPTH OF AGGREGATE DETERMINED BY FACILITY SIZING. IF CALTRANS CLASS 2 PERMEABLE IS NOT AVAILABLE,SUBSTITUTE CLASS 3 PERMEABLE WITH AN OVERLYING 3" DEEP CHOKING LAYER OF EITHER CALTRANS COURSEAGGREGATE 1/2" (NO. 4) OR 3/4" X (NO.4) OPEN-GRADED AGGREGATE.

11. BIORETENTION SOIL MEDIA (BSM) SPECIFICATION PER BIORETENTION TECHNICAL SPECIFICATIONS.

12. PLANT SELECTION PER BIORETENTION TECHNICAL SPECIFICATIONS.

13. MULCH PER BIORETENTION TECHNICAL SPECIFICATIONS.

14. LOCATE ENERGY DISSIPATION AS SPECIFIED IN INLET DETAILS.

15. NATIVE SIDE SLOPE 4:1 (H:V) PREFERRED, 3:1 WITH SHELF. 6" MINIMUM SHELF WITH 2% SLOPE TOWARDS FACILITYADJACENT TO PEDESTRIAN USE OR CURB UNLESS 4:1 SLOPE PROVIDED.

16. INCLUDE AT LEAST 1" DROP FROM CURB ABOVE MULCH LAYER.

17. AVOID DECORATIVE USE OF COBBLE THAT CAN INTERFERE WITH WITH INFILTRATION.

STREET SLOPE-SIDED BIORETENTION WITHPARKING, WITH UNDERDRAIN SW-1

SHEET 2 OF 2



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


SIDEWALK

CONSTRUCTION NOTES

MIN 24"BOTTOM WIDTH


CALTRANS CLASS 2 PERMEABLEMATERIAL (AGGREGATE). DEPTH PERPROJECT REQUIREMENTS OR MINIMUM12", SEE DESIGN NOTE 9



1. MAINTAIN UNDISTURBED NATIVE SOIL BENCH TO SUPPORT ADJACENT SIDEWALK/ROAD. SEQUENCE WORK TO CONSTRUCTCURBS BEFORE EXCAVATING BIORETENTION AREA FOR AGGREGATE AND BSM.







6" MIN NATIVE SOIL BENCH,12" PREFERREDOR AS DIRECTED BY CIVIL ORGEOTECHNICAL ENGINEER

STREET




OVERFLOW OUTLET-CONNECT TO STORM DRAIN ORAPPROVED DISCHARGE LOCATION

NATIVE SIDE SLOPE TO BEDETERMINED BYGEOTECHNICAL CONDITIONS.



3" MULCHLAYER

6" MIN



18" MIN



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE

CURB INLETDETAILSW-18, GUTTERINLET ELEV.(GIE)

CURB ANDGUTTER DETAILSW-12A

STREET SLOPE-SIDED BIORETENTION, WITHPARKING, NO UNDERDRAIN SW-1A

SHEET 1 OF 2

DESIGN NOTES









9. USE AND DEPTH OF AGGREGATE DETERMINED BY FACILITY SIZING. IF CALTRANS CLASS 2 PERMEABLE IS NOT AVAILABLE,SUBSTITUTE CLASS 3 PERMEABLE WITH AN OVERLYING 3" DEEP CHOKING LAYER OF EITHER CALTRANS COURSEAGGREGATE 1/2" (NO. 4) OR 3/4" X (NO. 4) OPEN-GRADED AGGREGATE.










VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET SLOPE-SIDED BIORETENTION, WITHPARKING, NO UNDERDRAIN SW-1A

SHEET 2 OF 2

CONSTRUCTION NOTES

4" MIN. EXPOSED WALLHEIGHT

SIDEWALK

FINISHED ELEVATION (FE)

CURB INLET WITHGRATE DETAILSW-19,GUTTER INLETELEV. (GIE)



3. FACILITY EXCAVATION TO ALLOW FOR SPECIFIED AGGREGATE, BSM, AND MULCH DEPTHS TO ACHIEVE FINISHED ELEVATIONS ON CIVILPLANS.

4. INSTALL UNDERDRAIN WITH HOLES FACING DOWN. TOP OF UNDERDRAIN 6" BELOW TOP OF AGGREGATE LAYER. UNDERDRAIN SLOPE MAYBE FLAT.

5. COMPACT EACH 6" LIFT OF BSM WITH LANDSCAPE ROLLER OR BY LIGHTLY WETTING. IF WETTING, LET DRY OVERNIGHT BEFORE PLANTING.



8. STORMWATER SHOULD BE DIRECTED AWAY FROM BIORETENTION UNTIL CONSTRUCTION IS COMPLETE AND DRAINAGE AREA VEGETATIONIS STABILIZED.

OVERFLOWSTRUCTUREELEV. (OE)

CALTRANS CLASS 2 PERMEABLEMATERIAL (AGGREGATE). DEPTHPER PROJECT REQUIREMENTS ORMINIMUM 12", SEE DESIGN NOTE 10

UNDERDRAIN, MIN. 4" DIA. PVCSDR 35 PERFORATED PIPE,SEE CONSTRUCTION NOTE 4


DEEP CURBDETAIL SW-13

UNDERDRAIN ANDOVERFLOW-CONNECT TO STORMDRAIN OR APPROVEDDISCHARGE LOCATION

6" MIN


18" MIN OR24" MIN IF

REQUIRED

2" MIN

3" MULCHLAYER

STREET

CURB ANDGUTTERDETAILSW-12



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX,WITH PARKING, WITH UNDERDRAIN SW-2

SHEET 1 OF 2

DESIGN NOTES

1. BIORETENTIONFACILITY DESIGN SHOULD OPTIMIZE THE FLAT BOTTOM DIMENSIONS (I.E., WIDTH, LENGTH) TO MAXIMIZETHE FUNCTIONAL AREA OF THE FACILITY.


3. PROVIDE SPOT ELEVATIONS AT INLETS AND OVERFLOW STRUCTURES ON CIVIL PLANS (FE,OE, GIE, SIE), PER DETAILSW-18.















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX,WITH PARKING, WITH UNDERDRAIN SW-2

SHEET 2 OF 2

CONSTRUCTION NOTES

4" MIN. EXPOSEDWALL OR CURBHEIGHT

SIDEWALK


CURB INLET WITHGRATE DETAIL SW-19,GUTTER INLETELEV. (GIE)




4. COMPACT EACH 6" LIFT OF BSM WITH LANDSCAPE ROLLER OR BY LIGHTLY WETTING. IF WETTING, LET DRY OVERNIGHT BEFOREPLANTING.






OVERFLOW OUTLET-CONNECT TOSTORM DRAIN ORAPPROVEDDISCHARGELOCATION



STREET6" MIN/12" MAX PONDING

18" MIN

3" MULCHLAYER




AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX,WITH PARKING, NO UNDERDRAIN SW-2A

SHEET 1 OF 2

DESIGN NOTES

















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX,WITH PARKING, NO UNDERDRAIN SW-2A

SHEET 2 OF 2

CONSTRUCTION NOTES









SIDEWALK

MIN 24"BOTTOM WIDTH













3" MULCHLAYER

6" MIN



18" MINOR 24" IF

REQUIRED

2" MIN

6" MIN

UNDERDRAIN, MIN. 4" DIA. PVCSDR 35 PERFORATED PIPE, SEECONSTRUCTION NOTE 4

STREET



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE

CURB INLET DETAILSW-18, GUTTERINLET ELEV. (GIE)

CURB ANDGUTTER DETAILSW-12



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET SLOPE-SIDED BIORETENTION, NOPARKING, WITH UNDERDRAIN SW-3

SHEET 1 OF 2

DESIGN NOTES




















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET SLOPE-SIDED BIORETENTION, NOPARKING, WITH UNDERDRAIN SW-3

SHEET 2 OF 2

SIDEWALK

CONSTRUCTION NOTES

MIN 24"BOTTOM WIDTH













STREET








3" MULCHLAYER

6" MIN



18" MIN



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE


CURB ANDGUTTER DETAILSW-12



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET SLOPE-SIDED BIORETENTION,NO PARKING, NO UNDERDRAIN SW-3A

SHEET 1 OF 2

DESIGN NOTES



















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET SLOPE-SIDED BIORETENTION, NOPARKING, NO UNDERDRAIN SW-3A

SHEET 2 OF 2

CONSTRUCTION NOTES


SIDEWALK





4. INSTALL UNDERDRAIN WITH HOLES FACING DOWN. TOP OF UNDERDRAIN 6" BELOW TOP OF AGGREGATE LAYER. UNDERDRAIN SLOPE MAYBE FLAT.




8. STORMWATER SHOULD BE DIRECTED AWAY FROM BIORETENTION UNTIL CONSTRUCTION IS COMPLETE AND DRAINAGE AREA VEGETATIONIS STABILIZED.






UNDERDRAIN AND OVERFLOW-CONNECT TO STORM DRAIN ORAPPROVED DISCHARGELOCATION

6" MIN



REQUIRED

2" MIN

3" MULCHLAYER

STREET



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE

CURB INLETDETAIL SW-17,GUTTER INLETELEV. (GIE)

CURB ANDGUTTERDETAIL SW-12



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX, NOPARKING, WITH UNDERDRAIN SW-4

SHEET 1 OF 2

DESIGN NOTES

1. BIORETENTIONFACILITY DESIGN SHOULD OPTIMIZE THE FLAT BOTTOM DIMENSIONS (I.E., WIDTH, LENGTH) TO MAXIMIZETHE FUNCTIONAL AREA OF THE FACILITY.

















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX, NOPARKING, WITH UNDERDRAIN SW-4

SHEET 2 OF 2

CONSTRUCTION NOTES

4" MIN. EXPOSED WALLOR CURB HEIGHT

SIDEWALK












OVERFLOW OUTLET-CONNECT TOSTORM DRAIN ORAPPROVEDDISCHARGELOCATION





AGGREGATE

NATIVE SOIL

STREET6" MIN/12" MAX PONDING

18" MIN

3" MULCHLAYER


ASPHALT PAVEMENT

CONCRETE



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX, NOPARKING, NO UNDERDRAIN SW-4A

SHEET 1 OF 2

DESIGN NOTES

















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION PLANTER BOX, NOPARKING, NO UNDERDRAIN SW-4A

SHEET 2 OF 2


CONSTRUCTION NOTES










AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE

SIDEWALK


FINISHEDELEVATION (FE)



6" MIN NATIVE SOIL BENCH,12" PREFERRED

OR AS DIRECTED BY CIVIL ORGEOTECHNICAL ENGINEER

STREET


18" MIN

CURB AND GUTTERDETAIL SW-12

3" MULCHLAYER








3:1 MAX.WITH SHELF,SEE NOTE 14




VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION BULB OUT, NOPARKING, NO UNDERDRAIN, SINGLE SLOPE SW-5

SHEET 1 OF 2

















DESIGN NOTES



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION BULB OUT, NOPARKING, NO UNDERDRAIN, SINGLE SLOPE SW-5

SHEET 2 OF 2

DESIGN NOTE:

1. THIS STANDARD DETAIL ASSUMES GRADUALLONGITUDINAL AND CROSS SLOPES OF THE ROADWAY.STEEPER SLOPES IN EITHER DIRECTION WILL IMPACTCONVEYANCE AND ELEVATION DIFFERENCES BETWEENTHE FACILITY AND ADJACENT ROADWAY, CURB, ANDSIDEWALK SURFACES. RETROFIT PROJECTS WILL FACEGREATER CONSTRAINTS THAN NEW CONSTRUCTION. SITESPECIFIC DESIGN IS CRITICAL TO AVOID GRADE CONFLICTSAND MAXIMIZING PONDING AREA. GRADING PLANS THATPROVIDE SPOT ELEVATIONS ACROSS THE ENTIRE FACILITYAND ALONG ADJACENT SURFACES ARE NECESSARY.

1/4" ALLEN WRENCH BOLTS,FLUSH

CONSTRUCTION NOTES:

1. INSTALL GRAVEL BAGS AT CURB CUTS TO BLOCK FLOWFROM ENTERING BIORETENTION AREA. CITY TO REMOVEGRAVEL BAGS AT A TIME FOLLOWING CONSTRUCTIONCOMPLETION.

BIORETENTIONAREA

BIORETENTIONAREA

CURB CUTOUTLET

CURB CUTINLET REMOVE AND REPLACE EXISTING

CURB & GUTTER WITH RAISEDDEEP CURB LENGTH OF FACILITY

RAISED DEEP CURBAT SIDEWALK PERLIDI DETAIL SW-15

CURB CUTOUTLET

2" DROPTO COBBLE

FE

CURB CUT INLET GRATE & FRAME



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


STREET BIORETENTION BULB OUT, MIDBLOCK CROSSING SW-5.1

SHEET 1 OF 1

AutoCAD SHX Text

1

AutoCAD SHX Text

2

CONSTRUCTION NOTES



3. FACILITY EXCAVATION TO ALLOW FOR SPECIFIED AGGREGATE, BSM, AND MULCH DEPTHS TO ACHIEVE FINISHED ELEVATIONSON CIVIL PLANS.


5. PLACE BSM IN 6" LIFTS. COMPACT EACH 6" LIFT OF BSM WITH LANDSCAPE ROLLER OR BY LIGHTLY WETTING. IF WETTING, LETDRY OVERNIGHT BEFORE PLANTING.




PARKING LOTPARKING LOT

FLUSH CURBSURFACEELEVATION (SE)SEE DETAIL SW-16

MIN 1" DROPSEE DESIGNNOTE 16

MIN 24"BOTTOM WIDTH









3" MULCHLAYER

6" MIN


2" MIN

6" MIN






REQUIRED



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE





VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT SLOPE-SIDED BIORETENTION,WITH UNDERDRAIN SW-6

SHEET 1 OF 2

DESIGN NOTES















15. NATIVE SIDE SLOPE 4:1 (H:V) PREFERRED, 3:1 WITH BENCH. 6" MINIMUM SHELF WITH 2% SLOPE TOWARDS FACILITYADJACENT TO PEDESTRIAN USE OR CURB UNLESS 4:1 SLOPE PROVIDED.





VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT SLOPE-SIDEDBIORETENTION, WITH UNDERDRAIN SW-6

SHEET 2 OF 2

PARKING LOT

CONSTRUCTION NOTES








PARKING LOT


MIN 1" DROPSEE DESIGNNOTE 15

MIN 24"BOTTOM WIDTH


CALTRANS CLASS 2 PERMEABLEMATERIAL (AGGREGATE).DEPTH PER PROJECT REQUIREMENTSOR MINIMUM 12", SEE DESIGN NOTE 9







3" MULCHLAYER

6" MIN



3:1 MAX. WITHSHELF, SEENOTE 14 OVERFLOW STRUCTURE

ELEV. (OE)

18" MIN



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE





VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT SLOPE-SIDEDBIORETENTION, NO UNDERDRAIN SW-6A

SHEET 1 OF 2

DESIGN NOTES



3. PROVIDE SPOT ELEVATIONS AT INLETS AND OVERFLOW STRUCTURE ON CIVIL PLANS (FE,OE, GIE, SIE), PER DETAIL SW-18.
















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT SLOPE-SIDEDBIORETENTION, NO UNDERDRAIN SW-6A

SHEET 2 OF 2

CONSTRUCTION NOTES1. MAINTAIN UNDISTURBED NATIVE SOIL BENCH TO SUPPORT ADJACENT SIDEWALK/ROAD. SEQUENCE WORK TO CONSTRUCT CURBS

BEFORE EXCAVATING BIORETENTION AREA FOR AGGREGATE AND BSM.



4. INSTALL UNDERDRAIN WITH HOLES FACING DOWN. TOP OF UNDERDRAIN 6" BELOW TOP OF AGGREGATE LAYER. UNDERDRAIN SLOPEMAY BE FLAT.






CURB INLET DETAILSW-17



UNDERDRAIN AND OVERFLOWCONNECT TO STORM DRAINOR APPROVED DISCHARGELOCATION



FINISHED ELEVATION(FE)


3" MULCHLAYER


REQUIRED DO NOT USE FILTER FABRICBETWEEN BSM AND AGGREGATE

6" MIN

2" MIN



6' MIN WIDTH



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT BIORETENTION PLANTERBOX, WITH UNDERDRAIN SW-7

SHEET 1 OF 2

DESIGN NOTES


















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT BIORETENTION PLANTERBOX, WITH UNDERDRAIN SW-7

SHEET 2 OF 2

CONSTRUCTION NOTES1. MAINTAIN UNDISTURBED NATIVE SOIL BENCH TO SUPPORT ADJACENT SIDEWALK/ROAD. SEQUENCE WORK TO CONSTRUCT

CURBS BEFORE EXCAVATING BIORETENTION AREA FOR AGGREGATE AND SOIL.


3. FACILITY EXCAVATION TO ALLOW FOR SPECIFIED AGGREGATE, BSM, AND MULCH DEPTHS TO ACHIEVE FINISHED ELEVATIONSON CIVIL PLANS.

4. COMPACT EACH 6" LIFT OF BSM WITH LANDSCAPE ROLLER OR BY LIGHTLY WETTING. IF WETTING, LET DRY OVERNIGHTBEFORE PLANTING.







18" MIN

CALTRANS CLASS 2 PERMEABLEMATERIAL (AGGREGATE). DEPTHPER PROJECT REQUIREMENTSOR MINIMUM 12", SEE DESIGNNOTE 9


FLUSH CURBSURFACEELEVATION (SE)SEE DETAIL SW-16CURB INLET

DETAIL SW-17


3" MULCHLAYER

DO NOT USE FILTERFABRIC BETWEEN BSMAND AGGREGATE

OVERFLOW OUTLETCONNECT TO STORMDRAIN OR APPROVEDDISCHARGE LOCATION

FINISHED ELEVATION(FE)

6' MIN WIDTH



AGGREGATE

NATIVE SOIL

ASPHALT PAVEMENT

CONCRETE



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT BIORETENTION PLANTERBOX, NO UNDERDRAIN SW-7A

SHEET 1 OF 2

DESIGN NOTES

















VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT BIORETENTION PLANTERBOX, NO UNDERDRAIN SW-7A

SHEET 2 OF 2

CONSTRUCTION NOTES


SIDEWALK


1. MAINTAIN UNDISTURBED NATIVE SOIL BENCH TO SUPPORT ADJACENT SIDEWALK/ROAD. SEQUENCE WORK TO CONSTRUCT CURBSBEFORE EXCAVATING BIOFILTRATION AREA FOR AGGREGATE AND BSM.




5. DO NOT WORK WITHIN BIOFILTRATION AREA DURING RAIN OR UNDER WET CONDITIONS.

6. KEEP HEAVY MACHINERY OUTSIDE BIOFILTRATION AREA LIMITS.

7. STORMWATER SHOULD BE DIRECTED AWAY FROM BIOFILTRATION UNTIL CONSTRUCTION IS COMPLETE AND DRAINAGE AREA VEGETATIONIS STABILIZED.






UNDERDRAIN ANDOVERFLOW-CONNECT TO STORMDRAIN OR APPROVEDDISCHARGE LOCATION



REQUIRED



AGGREGATE

NATIVE SOIL

3" MULCHLAYER

STREET

IMPERMEABLE LINER PER DETAILSW-24, BOTTOM LINER OPTIONALPER STRUCTURAL DESIGN


CURB ANDGUTTERDETAIL SW-12



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


BIOFILTRATION PLANTER BOX,NO PARKING SW-9

SHEET 1 OF 2

DESIGN NOTES

1. BIOFILTRATION FACILITY DESIGN SHOULD OPTIMIZE THE FLAT BOTTOM DIMENSIONS (I.E., WIDTH, LENGTH) TO MAXIMIZETHE FUNCTIONAL AREA OF THE FACILITY.



4. DUE TO SITE VARIABILITY, TO ENSURE THE LONG-TERM STRUCTURAL STABILITY OF THE BIOFILTRATION FACILITY AND ANYADJACENT INFRASTRUCTURE CONSULT WITH A GEOTECHNICAL ENGINEER.













VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


BIOFILTRATION PLANTER BOX,NO PARKING SW-9

SHEET 2 OF 2



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


R=3/4"

CONSTRUCTION NOTES

DESIGN NOTES

1. SPECIAL DESIGN CONSIDERATION OR STRUCTURAL REVIEW MAY BE REQUIRED FOR LONGER PLANTER WALL SPANS.STEEL REINFORCEMENT OR ADDITIONAL CONCRETE CHECK DAMS MAY BE NEEDED FOR STABILITY.

2. EDGE CONDITION WILL VARY FOR NEW AND RETROFIT PROJECTS. CURB, GUTTER, AND WALL DETAILS MAY BE MODIFIEDBY CIVIL AND GEOTECHNICAL ENGINEERS SUBJECT TO APPROVAL BY CITY ENGINEER.

3. CONCRETE AND EXPANSION JOINTS SHALL MEET THE REQUIREMENTS OF THE MUNICIPALITY.

4. STEEL REINFORCEMENT OR ADDITIONAL CONCRETE CHECK DAMS MAY BE NEEDED FOR STABILITY.

1. FINISH ALL EXPOSED CONCRETE SURFACES.

2. LAYBACK SLOPE AS FLAT AS POSSIBLE UNTIL TOP WIDTH PRODUCES 1:1 SLOPE & 24" BOTTOM WIDTH. AS PLANTER GETSWIDER MAINTAIN 1:1 SLOPE AND INCREASE BOTTOM WIDTH WIDER THAN 24". ALTERNATIVE TRENCH WALLCONFIGURATIONS MAY BE PROPOSED BY THE PROJECT GEOTECHNICAL ENGINEER (I.E. VERTICAL SHORING, REINFORCEDTRENCH SIDEWALL) THAT DO NOT REQUIRE SIDEWALK SUPPORT FROM THE LIGHTLY COMPACTED BSM.

6"

R=3/4"

REINFORCING PERMUNICIPAL STANDARD

1.5"

BIORETENTION AREA

AGGREGATE BASE PERMUNICIPAL STANDARD

MIN. 24"

SEECONSTRUCTIONNOTE 2

6" MIN.

30 MIL LINERREQUIRED ATSTREET (SWALEONLY)

MUNICIPAL STANDARDSWIDTH PER

CURB AND GUTTER SW-12SHEET 1 OF 1

6"

R=3/4"R=3/4"

1.5"

BIORETENTION AREA

AGGREGATE BASEPER MUNICIPALSTANDARD

MUNICIPAL STANDARDS 4"

6" MIN. SEECONSTRUCTIONNOTE 2

30 MIL LINERREQUIRED ATSTREET(SLOPE-SIDEDONLY)

18"

R=3/4"

CONCRETE VEHICLEACCESS STRIP

CONSTRUCTION NOTES

DESIGN NOTES

1. SPECIAL CONCRETE AND EXPANSION JOINS SHALL MEET THE REQUIREMENTS OF THE MUNICIPALITY.

2. PROVIDE OPENINGS IN CURB (12" WIDE) TO ALLOW FOR SURFACE DRAINAGE TO BIORETENTION AREAS IF DEDICATEDINLET NOT USED. SPACING TO BE DETERMINED BY PROJECT ENGINEER BASED ON DESIGN STORM TO MINIMIZEPONDING AGAINST CURB FOR MEDIAN ISLAND APPLICATION.


4. SEE REFERENCE DETAIL SW-24 FOR ATTACHMENT OF IMPERVIOUS LINER.


2. LAYBACK SLOPE AS FLAT AS POSSIBLE UNTIL TOP WIDTH PRODUCES 1:1 SLOPE & 24" BOTTOM WIDTH. AS PLANTERGETS WIDER MAINTAIN 1:1 SLOPE AND INCREASE BOTTOM WIDTH WIDER THAN 24". ALTERNATIVE TRENCH WALLCONFIGURATIONS MAY BE PROPOSED BY THE PROJECT GEOTECHNICAL ENGINEER (I.E. VERTICAL SHORING,REINFORCED TRENCH SIDEWALL) THAT DO NOT REQUIRE SIDEWALK SUPPORT FROM THE LIGHTLY COMPACTED BSM.

SEE DESIGN NOTE 4

1/2" DIAMETER SMOOTH DOWEL, 24"LONG AT ALL EXPANSION JOINTS OR

PER MUNICIPAL STANDARDS

6"

WIDTH PER



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


CURB AND GUTTER SW-12ASHEET 1 OF 1

6" R=3/4"

1/2" DIAMETER SMOOTH DOWEL, 24"LONG AT ALL EXPANSION JOINTS ORPER MUNICIPAL STANDARDS

R=3/4"

CONSTRUCTION NOTES

DESIGN NOTES

1. SPECIAL DESIGN CONSIDERATION OR STRUCTURAL REVIEW MAY BE REQUIRED FOR LONGER SWALE EDGE SPANS. STEELREINFORCEMENT OR ADDITIONAL CONCRETE CHECK DAMS MAY BE NEEDED FOR STABILITY.

2. WHEN SIDEWALK DRAINS TO PLANTER, PROVIDE 4" - 6" WIDE NOTCH OPENINGS, 1" BELOW SIDEWALK, SLOPED TOFACILITY, PER BIORETENTION PLANTER DETAILS. SPACE OPENINGS TO CONVEY FLOWS. PROVIDE MINIMUM 2" COVERBETWEEN DRAINAGE NOTCH OPENING AND DOWELS.




2. LAYBACK SLOPE AS FLAT AS POSSIBLE UNTIL TOP WIDTH PRODUCES 1:1 SLOPE & 24" BOTTOM WIDTH. AS PLANTER GETSWIDER MAINTAIN 1:1 SLOPE AND INCREASE BOTTOM WIDTH WIDER THAN 24". ALTERNATIVE TRENCH WALLCONFIGURATIONS MAY BE PROPOSED BY THE PROJECT GEOTECHNICAL ENGINEER (I.E. VERTICAL SHORING,REINFORCED TRENCH SIDEWALL) THAT DO NOT REQUIRE SIDEWALK SUPPORT FROM THE LIGHTLY COMPACTED BSM.

1.5"

STREET/SIDEWALK/PARKING

MIN. 24"

6" STREET/4" SIDEWALK

6"

STORMWATERFACILITY



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


DEEP CURB SW-13SHEET 1 OF 1

1/2" DIAMETER SMOOTH DOWEL, 24"LONG AT ALL EXPANSION JOINTS ORPER MUNICIPAL STANDARDS

8"

6"

SIDEWALK SECTION PERMUNICIPAL STANDARDS

SIDEWALK

CONSTRUCTION NOTES

DESIGN NOTES

1. SPECIAL DESIGN CONSIDERATION OR STRUCTURAL REVIEW MAY BE REQUIRED FOR LONGER FACILITY EDGE SPANS.STEEL REINFORCEMENT OR ADDITIONAL CONCRETE CHECK DAMS MAY BE NEEDED FOR STABILITY.

2. FINISHED ELEVATION REVEAL - WHERE SIDEWALK CONVEYS SHEET FLOW TO FACILITY, A 1"-2" REVEAL SHOULD BEMAINTAINED BETWEEN SIDEWALK AND FACILITY FINISHED GRADE TO AVOID MULCH OR PLANT BUILDUP FROM BLOCKINGFLOWS.



PROVIDE 2% SHELF ATPEDESTRIAN INTERFACE

1"-2"MIN. 12"

STORMWATERFACILITY

FINISHED ELEVATION REVEAL,SEE DESIGN NOTE



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


THICKENED EDGE SIDEWALK SW-14SHEET 1 OF 1

6"

MIN. 8"

1/2" DIAMETER SMOOTH DOWEL, 24"LONG AT ALL EXPANSION JOINTSOR PER MUNICIPAL STANDARDS

CONSTRUCTION NOTES

DESIGN NOTES

1. SPECIAL DESIGN CONSIDERATION OR STRUCTURAL REVIEW MAY BE REQUIRED FOR LONGER FACILITY EDGE SPANS.STEEL REINFORCEMENT OR ADDITIONAL CONCRETE CHECK DAMS MAY BE NEEDED FOR STABILITY.

2. EDGE CONDITION WILL VARY FOR PROJECTS. CURB DETAILS MAY BE MODIFIED BY CIVIL AND GEOTECHNICALENGINEERS SUBJECT TO APPROVAL BY CITY ENGINEER.


4. FINISHED ELEVATION REVEAL AT SIDEWALK - WHERE SIDEWALK CONVEYS SHEET FLOW TO FACILITY, A 1"-2" REVEALSHOULD BE MAINTAINED BETWEEN SIDEWALK AND FACILITY FINISHED GRADE TO AVOID MULCH OR PLANT BUILDUPFROM BLOCKING FLOWS AND REDUCE DROP AT PEDESTRIAN INTERFACE.


SIDEWALK/PARKING SECTIONPER MUNICIPAL STANDARDS(MAY BE USED WITH EXISTINGSURFACE)

PROVIDE 2% SHELF ATPEDESTRIAN INTERFACE

1"-2"

MIN. 12"

FINISHED ELEVATION REVEAL,SEE DESIGN NOTE

STORMWATERFACILITY

SIDEWALK/PARKING



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


FLUSH CURB AT SIDEWALK SW-15SHEET 1 OF 1

DESIGN NOTES

1. WHEEL STOPS MAY BE USED ON NON-FLUSH DESIGNS TO KEEP CARS FROM OVERHANGING BIORETENTION FACILITY.

2. VEHICLE OVERHANG CAN BE USED TO REDUCE IMPERVIOUS PAVEMENT AREA.

3. WHERE VEHICLE OVERHANG IS UTILIZED SELECT LOW GROWING PLANTS THAT WILL TOLERATE SHADING.

PARKING LOT

DEEP CURB


STORMWATERFACILITY

PARKING LOT

CURB AND GUTTER

CURB ANDGUTTER

DETAILSW-12

PARKING LOT

STORMWATERFACILITY

FLUSH EDGE/WHEEL STOPS

FLUSH CURBDETAIL SW-15

STORMWATERFACILITY



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PARKING LOT EDGE OPTIONS SW-16SHEET 1 OF 1

ST

RE

ET

4'-6"AA

STREET 1'-6"

12"-18"

12"C

UR

BC

UR

B

6"

1'-6"

6"

1'-6"

6"

8"

SECTION A-A

BIORETENTION DESIGN NOTES

1. FOR USE WITH STORMWATER FACILITIES WITHFLAT BOTTOMS.

2. PROVIDE SPOT ELEVATIONS ON PLANS (FE, OE,GIE, IE). SEE DETAIL SW-2, SW-2A, SW-4 ORSW-4A.

3. CURB AND WALL DETAILS MAY BE MODIFIED BYCIVIL AND GEOTECHNICAL ENGINEERSSUBJECT TO APPROVAL BY CITY ENGINEER.

4. CURB HEIGHT MAY BE REDUCED TO 4-INCHESWHERE ADJACENT TO A SIDEWALK. SEEDETAILS SW-12 & SW-13.

CONSTRUCTION NOTES

1. AFTER CONSTRUCTION PLACE SAND BAGSAT GUTTER OPENINGS TO KEEP STORMFLOWS FROM ENTERING FACILITY UNTILVEGETATION IS ESTABLISHED.

PLAN VIEW

PERSPECTIVE VIEW

6"

4" THICK CONCRETESPLASH PAD

DEPRESS GUTTER2" AT OPENING,GUTTER INLETELEVATION (GIE)

R=6"

R=3/4" TYP.

4" THICK CONCRETESPLASH PAD ATFACILITY FINISHEDELEVATION

DEPRESS GUTTER2" AT OPENING

R=3/4" TYP.

6"


CURB AND GUTTER,DETAIL SW-12


4"-6" MIN.

OR WIDER IFNEEDED TOHYDRAULICALLYPASS INFLOW



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


CURB CUT INLET FOR PLANTERS SW-17SHEET 1 OF 1

PLAN VIEW

6"

PERSPECTIVE VIEW


1. FOR USE WITH STORMWATER FACILITIESWITH SIDE SLOPES.

2. PROVIDE SPOT ELEVATIONS ON PLANS (FE,OE, GIE, IE). SEE DETAIL SW-1, SW-1A, SW-3OR SW-3A.

3. CURB AND WALL DETAILS MAY BE MODIFIEDBY CIVIL AND GEOTECHNICAL ENGINEERSSUBJECT TO APPROVAL BY CITY ENGINEER.

4. WHERE INLET FLOW VELOCITY IS HIGH,EXTEND COBBLE INTO FACILITY, BUT AVOIDEXCESSIVE USE.

5. CURB HEIGHT MAY BE REDUCED TO 4-INCHESWHERE ADJACENT TO A SIDEWALK. SEEDETAILS SW-12 & SW-13.

1'-6"

1 : 2

SECTION A-A

8"CURB RETURN

CURB RETURN

CONSTRUCTION NOTES

1. AFTER CONSTRUCTION PLACE SAND BAGS ATGUTTER OPENINGS TO KEEP STORM FLOWSFROM ENTERING FACILITY UNTIL VEGETATIONIS ESTABLISHED.

ST

RE

ET

4'-6"A

A

12"-18"

12"

CU

RB

CU

RB

2'-6"

1'-6"

STREET

DEPRESS GUTTER2" AT OPENING

1'-6"

8"

4"

PLACE 6" DEEP 3"-6"ROUNDED, WASHED, COBBLEAT CONCRETE INLET, SEEDESIGN NOTES

2'-0"

COBBLEENERGYDISSIPATION



CURB AND GUTTER,DETAIL SW-12


STORMWATERFACILITY

OR WIDER IFNEEDED TOHYDRAULICALLYPASS INFLOW

4"-6" MIN.



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


CURB CUT INLET FOR SLOPE SIDEDBIORETENTION SWALE SW-18

SHEET 1 OF 1

AutoCAD SHX Text

R=6"

AA

ST

RE

ET

6"

1" SHELF

18" GAP

DEPTH PERMANUFACTURER

B

B

INLET CURB

INLET CURB

18" MIN, 24" MAX

SIDEWALKOR PARKING

EGRESS

6"

2%

VARIES

2%

STORMWATER FACILITYFLAT BOTTOM OR

SLOPE SIDED

STORMWATERFACILITY

GU

TT

ER

CU

RB

PLAN VIEW

SECTION B-B

BIORETENTION DESIGN NOTES1. FOR USE WITH STORMWATER FACILITIES WITH SLOPED SIDES OR FLAT BOTTOMS.

2. PROVIDE SPOT ELEVATIONS ON PLANS (FE, OE, GIE, IPE). SEE DETAIL SW-2, SW-2A,SW-4 OR SW-4A.

3. REFER TO MUNICIPAL STANDARD DRAWINGS AND MATCH GUTTER PAN OF ADJACENTCURB AND GUTTER.

4. IF SLOPED SIDES, WHERE INLET FLOW VELOCITY IS HIGH, EXTEND COBBLE INTOFACILITY, BUT AVOID EXCESSIVE USE.

5. BASE MATERIAL FOR CURB, GUTTER, AND SIDEWALK PER MUNICIPAL STANDARDS.

6. GRATE AND FRAME SHALL SUPPORT H-20 LOADING (ALHAMBRA FOUNDRY A-1540/A-1551OR EQUIVALENT).

7. SOLID COVER AND FRAME (ALHAMBRA FOUNDRY A-1430/A-1433 OR EQUIVALENT) MAYBE USED IN PLACE OF GRATE AND FRAME.

SECTION A-A

CONSTRUCTION NOTES

1. AFTER CONSTRUCTION PLACE SANDBAGS AT GUTTER OPENINGS TO KEEPSTORM FLOWS FROM ENTERINGFACILITY UNTIL VEGETATION ISESTABLISHED.

12" TYP.

PLA

NT

ER

WA

LL

24"

2"

GRATE AND FRAME

DEPRESS GUTTER2" AT OPENING(GIE)

ADA COMPLIANTMANUFACTURED STEELGRATE AND FRAME

6" DEPTH OF 3" - 6"ROUNDED, WASHEDCOBBLE SPLASH PAD

BEVEL PLANTER WALL TOTOP OF INLET

INLET CHANNELWALLS GRATE/FRAME

WIDTH PERPLAN BOLT GRATE

IN PLACE

SEE GRATEAND FRAMEDETAILABOVE

WALL PER FACILITYDESIGN

OVERFLOW ELEV.PER FACILITYDESIGN (GOE)

GRATE

1/4" BOLTS,FLUSH

THREAD BOLTINTO FRAME PERMANUFACTURER

TOP OF GRATE =TOP OF CURB

FRAME

MATCH EXIST.CURB/GUTTER

EXPANSIONJOIN EACHSIDE (TYP.)

GUTTERFLOW LINE

COBBLE SPLASH PAD

DEPRESSGUTTER 2",(GIE)

INLET PANELEVATION(IPE)

DEPRESS GUTTER2", (GIE)

INLET PAN ELEVATION(IPE)

CURB ANDGUTTER, DETAILSW-12

SIDEWALK/GRATE FINISHED

ELEVATION(FE)

FLOW

PLA

NT

ER

WA

LL

6"

GU

TT

ER

CU

RB

4"-6" MIN.

18" MIN.



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


INLET WITH GRATE SW-19SHEET 1 OF 1

A

A

2" MIN

FLOW

SPECIFY

SPECIFY

SECTION A-A


1. FOR USE WITH STORMWATER FACILITIES WITH SLOPED SIDES.

2. BEST SUITED FOR FACILITIES WITH <= 2% LONGITUDINAL SLOPE.

3. PROVIDE ELEVATIONS AND STATIONING AND/OR DIMENSIONING FOR CHECK DAMS.

4. SPACE CHECK DAMS TO MAXIMIZE PONDING ACROSS ENTIRE CELL.

5. ENSURE THAT CHECK DAM ELEVATIONS DO NOT CAUSE STORMWATER TO OVERFLOW TO SIDEWALK.

CONSTRUCTION NOTES1. DO NOT WORK DURING RAIN OR UNDER WET CONDITIONS.

2. KEEP ALL HEAVY MACHINERY OUTSIDE BIORETENTION AREA LIMITS.

CURB AND GUTTERPER BIORETENTIONWITH SIDESLOPEDETAIL

4" -6" WASHED COBBLE

BIORETENTION SOIL MEDIA(BSM)

TOP OF CHECK DAM

SLOPE 2:1

4" - 6" WASHED COBBLE

SLOPE 2:1

BSM

SIDEWALKSTREET2" MIN



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


GRAVEL CHECK DAM SW-20SHEET 1 OF 1


1. FOR USE WITH BIORETENTION PLANTERS OR SLOPED SIDEDSWALES/RAIN GARDENS.

2. FOR CHECK DAMS LONGER THAN 12' SPECIFY REBAR OVERLAPLENGTH.

3. SPACE CHECK DAMS TO MAXIMIZE PONDING ACROSS CELLS.

4. PROVIDE ELEVATIONS AND STATIONING AND/OR DIMENSIONING FORCHECK DAMS.

5. ENSURE THAT CHECK DAM ELEVATIONS DO NOT CAUSESTORMWATER TO OVERFLOW TO SIDEWALK.

6. SHOW PLANTER WALL EMBEDDED IN EXISTING SUBGRADE ORDRAINROCK.

7. PREFERRED DESIGN IS TO CONSTRUCT TOP OF SIDEWALK ATGRADE WITH TOP OF PLANTER WALL TO ALLOW RUNOFF TOSHEETFLOW INTO BIORETENTION PLANTER. IF CURB IS NEEDED, USEALTERNATE DESIGN AND ENSURE TOP OF CONCRETE CHECK DAM ISA MINIMUM OF 1" BELOW BOTTOM OF CURB NOTCH.

CONSTRUCTION NOTES

1. EMBED #3 REBAR 3" INTO CURB AND PLANTERWALL.

2. DO NOT WORK DURING RAIN OR UNDER WETCONDITIONS.

3. KEEP ALL HEAVY MACHINERY OUTSIDEBIORETENTION AREA LIMITS.

SIDEWALK3" (TYP.)

3" (TYP.)

3" 3"EXISTING

SUBGRADE ORROCK STORAGE

3" (TYP.)

SEE CONSTRUCTIONNOTE 2

PLANTER WALL

LAP SPLICE #4 REBAR TO EMBEDDEDREBAR, OVERLAP 12" (SEE DESIGN NOTE2)

CURB AND GUTTER ORPLANTER WALL

BSM 18" MINBSM

6"

6"

TOP OF SIDEWALK

TOP OF PLANTER WALL

#4 REBAR

6" OF 3"-6"ROUNDED,WASHEDCOBBLE

EXISTINGSUBGRADE OR

ROCK STORAGE

FLOW

1" MIN.

SIDEWALK

3" (TYP.)

3" (TYP.)

3" 3"EXISTING

SUBGRADE ORROCK STORAGE

3" (TYP.)

SEE CONSTRUCTIONNOTE 2

PLANTER WALL

LAP SPLICE #4 REBAR TO EMBEDDEDREBAR, OVERLAP 12" (SEE DESIGN NOTE2)

CURB AND GUTTER ORPLANTER WALL

ALTERNATE DESIGN

PREFERRED DESIGN SEE DESIGNNOTE 7

SEE DESIGNNOTE 7



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


CONCRETE CHECK DAM SW-21SHEET 1 OF 1

24"

24 3 4"

9"

BEEHIVE GRATE

17 7/8"

24"x4" REVERSIBLE MANHOLE FRAME

10"

DESIGN NOTES1. PROVIDE GRATE OVERFLOW ELEVATION ON PLANS.

2. TO INCORPORATE FLEXIBILITY INTO DESIGN OVERFLOW ELEVATION OR CORRECT ELEVATION OF AN EXISTING STRUCTURE,INSTALL OVERFLOW COLLAR, PER DETAIL SW-22A.

3. IN PRIVATE SITES NOT IN CITY R/W THE PROJECT CIVIL ENGINEER MAY PROPOSE ALTERNATIVES FOR GRATE INSTALLATIONSUSING ALTERNATIVE MANUFACTURER'S PRODUCT/CONFIGURATION.

CONSTRUCTION NOTES1. DO NOT ADJUST OVERFLOW GRATE ELEVATION, CONSTRUCT AS SHOWN ON PLANS.

SLOPE TO DRAIN

WIRE ROPE

SPECIFY GRATE OVERFLOWELEVATION TO ACHIEVEDESIGN PONDING DEPTH (GOE)

ADJACENT STORMWATERFACILITY PLANTINGSURFACE

#4 REBAR U-BOLT

CONNECT TO APPROVEDDISCHARGE POINT

2500 PSI COMMERCIALGRADE CONCRETE

BEEHIVE GRATE, SEE BELOW

MANHOLE FRAME, SEE BELOW

EPOXY MANHOLE FRAME TO STD.REINF. CONC. PIPE CLASS III

MANHOLE RING AND BEEHIVE GRATE MH25BH BYOLYMPIC FOUNDRY OR APPROVED EQUAL

GROUT PIPE AT BASE

STD. REINF. CONC. PIPE CLASS III

PRECAST OR POURED IN PLACE6" MIN. DEPTH

19 3/4"19"

17 7/8"

19"

25 3/8"

3"1/2" 3/4"

PONDINGDEPTH

GROUT AT CONNECTION



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


OVERFLOW STRUCTURE WITHBEEHIVE GRATE SW-22

SHEET 1 OF 1

DESIGN NOTES1. MAY BE USED IN CONJUNCTION WITH OVERFLOW STRUCTURES TO ALLOW FOR FIELD ADJUSTMENT OF

OVERFLOW ELEVATION, OR AS RETROFIT TO CORRECT EXISTING STRUCTURE THAT DOES NOT ALLOWPONDING TO OCCUR.

2. PROVIDE COLLAR OVERFLOW ELEVATION (COE) ON PLANS.

3. PCC PIPE RISER EXTENSIONS MAY BE UTILIZED IN LIEU OF OVER FLOW STRUCTURE COLLAR.

CONSTRUCTION NOTES

1. CENTER COLLAR ON OVERFLOW GRATE.

SPECIFY COLLAR OVERFLOWELEVATION TO ACHIEVE DESIGNPONDING DEPTH (COE)

ADJACENT STORMWATERFACILITY PLANTINGSURFACE

OVERFLOW STRUCTURE

2"-5"

MIN. 10"

30" OR 36" DIA. STEEL OR RIGIDPLASTIC PIPE COLLAR, OR DIA. ASNEEDED TO SURROUND EXISTINGOVERFLOW STRUCTURE FORRETROFITS

BACKFILL WITH CALTRANS CLASS2 OR 3 PERMEABLE

PONDING DEPTH VARIES



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


OVERFLOW STRUCTURE COLLAR SW-22ASHEET 1 OF 1

C.I. GRATE

C.I. FRAME

EXTENSION

BOTTOM

DESIGN NOTES

1. PROVIDE GRATE OVERFLOW ELEVATION ON PLANS.

2. PROVIDE EXTENSION OVERFLOW ELEVATION (COE) ON PLANS.

3. ON PRIVATE SITES NOT IN CITY RIGHT-OF-WAY THE PROJECT CIVIL ENGINEER MAY PROPOSEALTERNATIVES FOR GRATE INSTALLATIONS USING ALTERNATIVE MANUFACTURER'SPRODUCTION/CONFIGURATION.

CONSTRUCTION NOTES

1. DO NOT ADJUST OVERFLOW GRATE ELEVATION, CONSTRUCT AS SHOWN ON PLANS.



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


OVERFLOW STRUCTURE WITHSQUARE GRATE SW-23

SHEET 1 OF 1

HDPE ORPVC 30MILLINER

1/8" MIN ALUMINUM FLATBAR, 2" WIDTH

2" x 1/4" HIT ANCHOR 12"O.C.

TRIM LINER TO TOP EDGE OF FLAT BAR. SILICONESEAL TOP EDGE OF FLAT BAR. TOP OF LINER TO BE3" BELOW SOIL LEVEL.

ADJACENTCURB ORPLANTER

WALL

DEPTH OF LINER PERCIVIL/GEOTECHNICALENGINEER

BIORETENTIONFACILITY



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


IMPERMEABLE LINER CONNECTION SW-24SHEET 1 OF 1

WASHED 4" ASTM NO. 57 BASE ORSIMILAR CRUSHED AGGREGATE OVERASTM NO. 2, 3, OR 4 AGGREGATESUBBASE - THICKNESS VARIES WITHWATER STORAGE AND TRAFFIC.

PAVERS WITH (MAX 12" WIDE) OPEN SURFACESPACES. FILL WITH WASHED ASTM NO. 8, 89

OR 9 AGGREGATE (NOTE 6)

POROUS ASPHALT: USE WASHED 1" -2" CHOKE LAYER OF WASHED NO. 57AGGREGATE OVER ASTM NO. 2, 3 OR4 AGGREGATE - THICKNESS VARIESWITH WATER STORAGE AND TRAFFICLOADS.

PERVIOUS CONCRETE: USE WASHEDASTM NO. 57 AGGREGATE -THICKNESS VARIES WITH WATERSTORAGE AND TRAFFIC LOADS.

SUBGRADE, SEE DESIGNREQUIREMENTS FORCOMPACTION INFORMATION

GEOTEXTILE IF SPECIFIED

POROUS ASPHALT OR PERVIOUSCONCRETE

SUBGRADE, SEE DESIGNREQUIREMENTS FORCOMPACTION INFORMATION

GEOTEXTILE IF SPECIFIED

RESIDENTIALDRIVEWAY

ORPEDESTRIAN

ONLY

PRIVATESTREET,PARKING

LOT

PUBLICSTREETOR FIRE

LANE

PERVIOUSCONCRETE

POROUSASPHALT

PERMEABLEINTERLOCKINGPAVERS

ENGINEERINGREQ'D

COMPACTIONREQ'D

4"

3"

2 3 8"

NO

NO YES

YES

3 18"

4"

6"

95%

YES

3 18"

6"

8"

NOTES:

1. UNDERDRAIN TO REMOVE WATER THATCANNOT BE INFILTRATED WITHIN 72 HOURS.

2. DESIGNS PROVIDED SHALL BE SIGNED &STAMPED BY A GEOTECHNICAL &/OR CIVILENGINEER REGISTERED IN THE STATE OFCALIFORNIA.

3. GEOTEXTILE USE AND SELECTION MAY BEDETERMINED BY A GEOTECHNICAL ENGINEERPER AASHTO M-288.

4. UNDERDRAIN AND ORIFICE CONFIGURATIONSHALL BE BASED ON ENGINEERED DESIGN.

EDGE RESTRAINTAS SHOWN ON PLANS

EDGE RESTRAINTAS SHOWN ON PLANS

1 12" TO 2" ASTM NO. 8 BEDDINGLAYER



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PERVIOUS PAVEMENT SW-25SHEET 1 OF 1



VERSION:

STANDARD PLAN NO.

08/31/2017

APPROVED BY:


PLANTING INUNDATION ZONES

SHEET 1 OF 4

AutoCAD SHX Text

SW-26

DESIGNED BY:

DRAWN BY:

CHECKED BY:

TITLE:

DEPARTMENT OF PUBLIC WORKS

IMPE`RIAL BEACH

STANDARD PLAN

CITY ENGINEER:

DATE:APPROVED:

ZONE A LID RECOMMENDED PLANT LIST

SW-26SHEET 2 OF 6

DESIGNED BY:

DRAWN BY:

CHECKED BY:

TITLE:


IMPE`RIAL BEACH

STANDARD PLAN

CITY ENGINEER:

DATE:APPROVED:


SW-26SHEET 3 OF 6

DESIGNED BY:

DRAWN BY:

CHECKED BY:

TITLE:


IMPE`RIAL BEACH

STANDARD PLAN

CITY ENGINEER:

DATE:APPROVED:


SW-26SHEET 4 OF 6

DESIGNED BY:

DRAWN BY:

CHECKED BY:

TITLE:


IMPE`RIAL BEACH

STANDARD PLAN

CITY ENGINEER:

DATE:APPROVED:


SW-26SHEET 5 OF 6

DESIGNED BY:

DRAWN BY:

CHECKED BY:

TITLE:


IMPE`RIAL BEACH

STANDARD PLAN

CITY ENGINEER:

DATE:APPROVED:


SW-26SHEET 6 OF 6

VARIES

BIORETENTIONSOIL MEDIA

(18" MIN)

6"

SIDEWALKSTREET

4

3

710

11

13

8

14

12

6

5

15

2

12" MIN

1

EXISTINGSUBGRADE

INFILTRATION WELL

24

16

23

9 SIDEWALKINLET ELEV.(SIE):

OVERFLOWSTRUCTURE

ELEV. (OE)

17

18 19 20

21

CLAY

MIN. 10ft abovegroundwater

SIDEWALK

16

22

10

8

15

CURB

CLAY

28

22

27

SIDEWALK

EXISTING STORM DRAIN EXISTING STORM DRAIN

31

TO STORMDRAIN

TO STORM DRAIN(if needed)

26

25

29

30

21

3:1 MAX

3:1 MAX

SEE PAGE 2 FOR CALL OUT SPECIFICATIONS AND DESIGNNOTES

6" MIN./ 12" MAX.PONDING DEPTH



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STANDARD PLAN NO.

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APPROVED BY:


DRYWELL STORMWATER BMP

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AutoCAD SHX Text

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SPECIFICATIONS1. 12” DEEP OPEN GRADED WASHED STONE (TYPICALLY 3/4” TO 1-1/2” (ASTM #4 STONE) OR 1” TO 2” (ASTM #3 STONE).2. BRIDGING LAYER(S) PER LIDI BIORETENTION TECHNICAL SPECIFICATIONS (BTS). DO NOT USE FILTER FABRIC BETWEEN BSM AND AGGREGATE. DO NOT USE

FILTER FABRIC BETWEEN BIOFILTER SOIL MATERIAL (BSM) AND AGGREGATE.3. 30 ML LINER MAY BE REQUIRED TO AVOID LATERAL INFILTRATION BELOW STREET; SUBJECT TO GEOTECHNICAL RECOMMENDATIONS.4. MAINTAIN 6” MINIMUM BENCH OF NATIVE SOIL FOR SUPPORT OF ADJACENT SIDEWALK/ROAD (TYPICAL).5. CURB AND GUTTER DETAIL SW-12.6. CURB INLET DETAIL SW-17, GUTTER INLET ELEV (GIE). LOCATE ENERGY DISSIPATION COBBLE PADS AS SPECIFIED IN INLET DETAILS.7. OVERFLOW STRUCTURE REQUIRED FOR IN-LINE SYSTEMS WITHOUT OVERFLOW BYPASS, DETAIL SW-22, SW-22A, and SW-23.8. MAINTENANCE PIPES - 4” MIN. DIA. VERTICAL PVC PIPES CONNECTED TO UNDERDRAIN. PLACED AT START AND 3 FEET BEFORE END OF UNDERDRAIN.

REQUIRES DIRECTIONAL SWEEP BEND. THREADED AND CAPPED9. VEGETATION - PLANT SELECTION AND MULCH (OPTIONAL) PER BIORETENTION TECHNICAL SPECIFICATIONS.10. 4” MIN. EXPOSED WALL HEIGHT11. SIDEWALK DRAINAGE NOTCH 1” LOWER THAN SIDEWALK, SLOPED TO FACILITY12. SEE PLANS FOR SIDEWALK RESTORATION13. DEEP CURB DETAIL SW-1314. BIORETENTION SOIL MEDIA (BSM). SPECIFICATION PER BIORETENTION TECHNICAL SPECIFICATIONS (BTS). SPECIFICATION SHOULD AVOID COMPOST OR

OTHER MATERIAL KNOWN TO LEACH NUTRIENTS.15. UNDERDRAIN, MIN. 4” DIA. PVC SDR 35 PERFORATED PIPE OR LARGER AS NEEDED TO CONVEY PEAK TREATED FLOWRATE WITH MINIMAL HEAD LOSS, SEE

CONSTRUCTION NOTES.16. 8” INLET PIPE OR OTHER.17. LOW FLOW ORIFICE. (SEE DESIGN NOTE 11).18. STABILIZED BACKFILL - TWO-SACK SLURRY MIX.19. SIDEWALK PER MUNICIPAL STANDARDS.20. COMPACTED BASE MATERIAL.21. ACCESS HATCH WITH SHUT OF VALVE SWITCH. CONNECTED TO SHUT OF VALVE IN INLET PIPE.22. MAINTENANCE HOLE COS TYPE 204-204 MH A OR B. ¾” I.D. MIN OBSERVATION PORT.23. MANHOLE CONE - MODIFIED FLAT BOTTOM.24. EXISTING SOILS. (SEE CONSTRUCTION NOTE 4, 8).25. COMPACTED BACKFILL26. PRE-CAST OR INSITU CAST CONTROL VAULT (SEE DESIGN NOTE 8)27. ROCK - WASHED, SIZED BETWEEN 3/8” AND 1-1/2"28. PERFORATED BASE OF CONTROL VAULT29. DRILLED SHAFT WITH 6” WELDED STEEL OR THREADED PVC CASING (SEE DESIGN NOTE 13 & CONSTRUCTION NOTE 7,8)30. 6 - 8” O.D. WELDED WIRE STAINLESS STEEL WELL SCREEN OR THREADED PVC SLOTTED SCREEN. SCREEN LENGTH + LENGTH + SLOT WIDTH TO BE

DETERMINED IN ACCORDANCE WITH LOCAL CONSTRAINTS .I.E. DISTANCE BETWEEN CLAY LAYER AND MIN. 10FT ABOVE SEASONAL HIGH GROUNDWATERLEVEL

31. PVC STORMDRAIN CONNECTOR PIPE. SAME DIAMETER AS INFLOW PIPE TO CONTROL VAULT.

DESIGN NOTES1. ADDITIONAL DESIGN GUIDANCE FOR BIOFILTRATION SYSTEM PROVIDED IN LIDI BIORETENTION TECHNICAL SPECIFICATIONS (BTS) DOCUMENT.2. BOTTOM WIDTH - PROVIDE 2 FT MINIMUM FLAT BREGENALL3. BOTTOM WITH A MAX 3:1 SLOPE FOR SURFACE FINISHING WITHIN BIOFILTRATION SYSTEM4. IF CALTRANS CLASS 2 PERMEABLE IS NOT AVAILABLE, SUBSTITUTE CLASS 3 PERMEABLE WITH AN OVERLYING 3” DEEP LAYER OF ¾” (NO. 4) OPEN-GRADED

AGGREGATE.5. PROVIDE SPOT ELEVATIONS AT INLETS ON CIVIL PLANS (FE, OE, GIE, SIE). SEE DETAIL SW-17.6. EDGE CONDITION WILL VARY FOR NEW AND RETROFIT PROJECTS. CURB, WALL, AND SIDEWALK DETAILS MAY BE MODIFIED FOR PROJECT BY CIVIL AND

GEOTECHNICAL ENGINEERS.7. PROVIDE MONITORING WELL IN EACH FACILITY, PER BIORETENTION TECHNICAL SPECIFICATIONS.8. LONGITUDINAL SLOPE 6% WITH CHECK DAMS.9. IF CHECK DAMS ARE NEEDED, SEE CONCRETE CHECK DAM DETAIL SW-18.10. VARIATIONS IN DRY WELL DESIGN SHOULD BE MADE TO ACCOMMODATE STORAGE VOLUME DESIGN AND TO SUIT LOCAL CONDITIONS AND

CONSTRAINTS.11. IN AREAS WITHOUT A STORMDRAIN, THE SYSTEM SHOULD ONLY BE CONSTRUCTED WHERE THE MAINTENANCE HOLE SURFACE INVERT IS ABOVE THE

BIOFILTER OVERFLOW ELEVATION.12. ALTERNATIVE VAULT LOCATIONS POSSIBLE INCLUDING WITHIN THE BIOFILTER FOOTPRINT.13. VALVE CAN BE MOVED TO THE BIOFILTER IF DESIRED. REQUIRES STRUCTURAL SUPPORT.14. ALTERNATIVE PRODUCTS SUCH AS VENDOR-SUPPLIED DRY WELL PRODUCTS MAY BE USED AS A SUBSTITUTE PROVIDED THAT THE ALTERNATIVE PRODUCT

IS EQUAL.15. THIS DESIGN IS LIKELY TO QUALIFY AS A CLASS V WELL SUBJECT TO REGISTRATION WITH THE USEPA.



VERSION:

STANDARD PLAN NO.

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APPROVED BY:


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Version: 5/16/17

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Low Impact Development Initiative (LIDI) Bioretention Technical Specifications

The following technical information is for use in conjunction with the complete set of bioretention area standard details developed by the LIDI for use in the Central Coast region and throughout California. Central Coast region-specific requirements are noted where applicable.

Facility Design/Dimensions

Bioretention facilities should be sized to retain and/or treat the water quality design flow and/or volume in accordance with the stormwater permit requirements that apply to the local jurisdiction and appropriate local, countywide, and/or statewide (CASQA) guidance documents. Design parameters specified in stormwater permits will determine the surface area and storage volume required within the facility.

Bottom width – facilities should have flat bottoms and sufficient width for ease of constructability and maintenance. – Provide 2’ wide minimum for facilities with side slopes and planters

(facilities with vertical side walls).

Allowable standing water duration – generally 48 to 72 hours Allowable ponding time is typically associated with mosquito vector control or perceived nuisance flooding and varies by location.

Ponding depth - Min. 6", max. 12". The depth is measured from the surface of the bioretention soil media and not adjusted for application of mulch.

Planter depth – (from adjacent pedestrian walking surface to facility finished elevation/planting surface) is based on desired ponding plus freeboard, but also relates to planter width. Planters can be deeper if they are wider, and need to be shallower as they narrow. This is a pedestrian perception and safety issue. Some recommended width to depth guidelines are as follows (allowable depths and appropriate edge treatments may be specified by the local jurisdiction and may be determined by ADA requirements):

PLANTER WIDTH

MAX. PLANTER

DEPTH > 5’ 16”

4’ – 5’ 12” 3’ – 4’ 10” 2’ – 3’ 8”

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Slope/grades

– Side slope - 4:1 preferred • Max. 3:1 allowed with min. 12" wide shoulder (2% slope toward

facility) adjacent to pedestrian use or curb.

– Longitudinal slope – Facility should be relatively flat (i.e., maximum of 2% longitudinal slope of bottom) so that water ponds and infiltrates evenly across the facility surface. • If installed on a slope, facilities should be terraced and separated

by check dams and weir overflows to provide flat-bottomed cells with proper storage and infiltration.

• Installation not recommended on slopes > 8%.

– Grades on opposite sides within a facility should be similar to optimize ponding across the entire basin/cell.

Hard Infrastructure

Inlet curb cut design selection should be based on application considerations:

– Sloped sided or planter facility – Curb and gutter adjacent to facility or separated by pedestrian sidewalk

Curb cut width – 12”-18” minimum, with rounded edges, depress gutter 2” at opening (see SW-14, SW-15, SW-16)

Sidewalk edge type selection should be based on application considerations:

– New or retrofit – Sloped sided or planter box

Sidewalk wall - planter box requires 4” min. height wall adjacent to sidewalk for pedestrian safety.

Sidewalk wall drainage notch – when sidewalk drains to planter, provide 4”-6” wide notch openings in wall, opening 1” below sidewalk, slope to facility. Space openings to convey flows.

– Provide minimum 2” cover between notch and structural dowels in curbs/walls.

Energy dissipation – provide aggregate or concrete splash pads at inlets per inlet details.

– For aggregate: 6” depth, 3" – 6" rounded, washed cobble – For sloped sided facilities where inlet flow velocity is high, extend cobble

into facility, but avoid excessive or decorative use.

Where impermeable liner is included between facility and adjacent

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infrastructure (street, parking lot), use 30 ML HDPE or PVC material, see Impermeable Liner detail.

Check dams – provide for facilities installed on slope

– Per check dam details SW-17 and SW-18 – Check dams should be placed for every 4-6” of elevation change and so

that the top of each dam is at least as high as the toe of the next upstream dam.

Overflow structure – required for on-line systems without an overflow bypass

– Per overflow structure details SW-19, SW-20 – Connect to approved discharge point or another downstream bioretention

area. Provide observation well in facility if required

– Upright 6 inch rigid PVC (SDR 40 or equivalent) pipe, perforated for the section extending through the depth of the bioretention soil media (and aggregate layer if included), extending 6 inches above the top of soil elevation, with a threaded cap.

– Locate to avoid damage from maintenance activities. Facility Media (soil, aggregate, mulch)

Aggregate layer – where an aggregate layer is included in the design (underdrain design or optional use based on project requirements, depth based on sizing calculations), specify “CalTrans Class 2 Permeable.”

– CalTrans Class 2 Permeable does not require an aggregate filter course between the aggregate storage layer and the bioretention soil media above.

– When CalTrans Class 2 Permeable is not available, substitute CalTrans Class 3 Permeable.

• Class 3 Permeable requires an overlying 3” deep layer of ¾” (No. 4) open graded aggregate (between Class 3 and bioretention soil media above).

– Filter fabric - do NOT use fabric between bioretention soil media and aggregate layer

Bioretention soil media (BSM) - use local jurisdiction approved/recommended BSM (e.g. Bay Area Stormwater Management Agencies Association (BASMAA) Regional Biotreatment Soil Specification (revised January 29, 2016)1.

1 http://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/stormwater/MRP/provisionC.3/Revised_%20Biotreatment%

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– Using a performance specification for alternative bioretention soil mix is not recommended (but may be allowed by the local jurisdiction).

– A pre-mixed bioretention soil media is preferable to mixing soil on-site. BSM depth – 18” minimum depth; 24” recommended, or as required by the

local jurisdiction. 24” depth required in the Central Coast Region for facilities with underdrains. – Where trees are specified, increase BSM depth in tree planting

locations, per arborist’s or landscape architects direction, or allow trees access to sufficient volume of native soil.

• Tree planting in bioretention - see BASMAA Literature Review - Bioretention Design for Tree Health (September 15, 2016)2

Bioretention soil media placement and compaction – place BSM in 6” lifts. Compact each lift with a landscape roller or by lightly wetting. Allow BSM to dry overnight before planting.

Mulch depth – 2” – 3” (3” recommended and required by State Model Water Efficiency Landscape Ordinance) – Do not apply mulch in ponding zone just prior to or during rainy season. – When mulch is used, excavation must allow for specified bioretention soil

depth to achieve finished elevations as shown on civil plans

Mulch type - when used in ponding zone, must be aged, stabilized, non-floating mulch, such as a specified composted wood mulch. Gravel mulch may also be used when high flow velocities through the system are expected.

Landscape (planting and irrigation)

Irrigation - Provide irrigation for plant establishment (2-3 years), and supplemental irrigation during periods of prolonged drought.

– Provide separate zone for connection to water supply Planting - see LIDI plant guidance for bioretention areas technical

assistance memo (TAM) or use bioretention plant list in other local or countywide guidance document.

– Landscape Architects who have not previously designed bioretention systems should use plants from the LIDI TAM or other approved plant list. Landscape Architects with experience designing for bioretention may use additional plant species consistent with the above lists and

20_Soil.pdf 2 www.basmaa.org

http://www.basmaa.org/

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appropriate for the facility design and local conditions.

– Do not locate plants at inlets. Consider mature growth to determine planting layout and avoid future blockage of inlets by plants.

– Trees located on slopes should be 5’ minimum from inlets to avoid erosion of soil at root ball.

Underdrain Design

Aggregate layer depth – 12” minimum depth.

Underdrain – use 4” diameter, PVC SDR 35 perforated pipe.

– Install underdrain with holes facing down. – Underdrain discharge elevation should be near top of aggregate layer if

facility is allowed to infiltrate into native soil. – Underdrain slope may be flat or have a slight slope. – Connect underdrain to approved discharge point. – Provide capped, threaded PVC cleanout for underdrain, 4" min. dia. with

sweep bend. – Do NOT wrap underdrain with filter fabric.

Documents

CASQA LIDI BIORETENTION DETAILS · design notes 1.bioretention facility design should optimize the flat bottom dimensions (i.e., width, length) to maximize the functional area of